A meeting will held at Sydney's Royal North Shore Hospital this afternoon to try to work out how many staff are needed to help solve a longstanding dispute.

Industrial action was averted last week when the New South Wales Industrial Relations Commission intervened, saying it wanted a report from a specially set-up consultative group.

Gerard Hayes from the Health Services Union East branch says that group will meet this afternoon to talk about staffing levels.

"The crux of the matter is quite clear," he said.

"At the end of the day, once we work out the appropriate staffing levels for the workload, who is going to fund that?"

ISS says its contract with New South Wales Health did not allow for the extra beds which have been put in place at the hospital.

The company's chief executive Dane Hudson says his organisation initially put on an extra 80 casual staff to cope with the extra level of cleaning required, but NSW Health refused to compensate them.

"The situation is, back in 2007 - when we bid on this contract - there were less than 600 beds in the hospital. That's publicly-available information," he said.

"Now, there are close to 740 beds in the hospital. That's the issue, that there's 140 more beds in the hospital and that means there's more patients, there's more cleaning, there's more portering, there's more movement.

"We want to be compensated for that change in activity."

NSW health Minister Jillian Skinner says health bureaucrat Mike Wallace is doing a review and she is confident measures introduced on the weekend will help.

"In the mean time we're employing an extra 20 cleaners," she said.

"There's much better prioritisation of the cleaning process, and furthermore they're extending the helpline so that any person in a position of responsibility in the hospital who believes that cleaning is urgent in a particular place can ring that helpline."